#define _CRT_SECURE_NO_WARNINGS  1
#include <stdio.h>

int main()
{
    int a = 0;
    int b = 0;
    int c = 0;

    while (scanf("%d %d %d", &a, &b, &c) != EOF)
    {
        if (a + b > c && a + c > b && b + c > a)
        {
            if (a == b && a == c)
                printf("Equilateral triangle!");
            else if ((a == b && b != c) || (a == c && a != b) || (b == c && b != a))
                printf("Isosceles triangle!\n");
            else
                printf("Ordinary triangle!\n");
        }
        else
            printf("Not a triangle!");

    }
    return 0;
}